DATA AFFECTING SUBMERGENCE THEORY 235 



Exact data for the N'ew Hampsliire section are not yet available in 

 sufficient amount. At Hanover the datum plane marks about 555 feet, 

 but a fair bar, apparently formed in submergence, is 565 feet, and the 

 delta terraces are 575 or higher. Beyond the north line of Massachusetts 

 the available data is meager. The writer has seen the abundant features, 

 but has not taken measurements on the summit level. The figures for 

 altitudes given by Upham and Dana can not confidently be used, since 

 they did not recognize standing water and in consequence did not discrim- 

 inate the static plane. The '^normal" terraces are far below the level of 

 the standing waters, while the "tributary," or delta, terrace levels evi- 

 dently include fioodplain deposits much above the static water level. 



Connecticut valley ixferences. — The numerals refer to the features in- 

 dicated on the chart. 



22. Portland, Connecticut. Two heavy gravel bars on west side of hill, in the 

 northwest part of the village, at 200 and 220 feet by the map. 



27. Plains at Manchester, Connecticut, 9 miles east of Hartford. Summit, 260 

 feet. 



For Massachusetts the reader is referred to Emerson's maps, the datum 

 plane being based on his data. 



For New Hampshire and Vermont the data are taken from Upham's 

 paper, except number 64. The altitudes are those given for "tributary'' 

 deltas. 



44. Northfield, Massachusetts, delta terraces, 375-390 feet. 

 46. Hinsdale, New Hampshire, 380-430. 



48. Brattleboro, 409-425. 



49. Dummerston, 420-440. 



53. Bellows Falls, 1 mile south, 465-486. 



57. North Chesterton, 475-530. 



59. West Claremont, 520-540. 



60. Windsor, 540. 



63. White River Junction, 550. 



64. Hanover, delta of Mink Brook; bar, 565; upper terraces, 575. 



65. Mouth of Pampanoosic River, 590. 

 68. Oxford and Fairlee, 560-590. 



70. Piermont, 500-650. 



71. Bradford, up to 600. 

 73. Wells River, 600-660. 



76. Stevens River, 675. 



77. Mouth of Passumpsic River, 650, ''normal." 



Farther north the river valley lies above the marine plane. 

 Hudson-Champlain valley references. — From 'New York Bay north- 

 ward to Haverstraw Bay numerous terraces have close agreement with the 



